Assembly for stopping and locking the printing rollers in a platen printing press



United States Patent Inventor Artur Buettner Heidelberg, Germany Appl No. 728,736 Filed May 13,1968 Patented Dec. 29, 1970 Assignee Heidelberger Druckmaschinen Aktiengesellschalt Heidelberg, Germany a corporation of Germany Priority May 19,1967

Germany No. Sch40735 ASSEMBLY FOR STOPPING AND LOCKING THE PRINTING ROLLERS IN A PLATEN PRINTING PRESS 1 Claim, 2 Drawing Figs.

U.S. Cl. 101/359 Int. Cl. 841i 1/50 Field of Search 101/ 359- [56] References Cited FOREIGN PATENTS 26.011 10/1914 Great Britain 101/362 382,138 9/1923 Germany 101/362 541,610 1/1932 Germany 101/361 Primary Examiner-Robert E. Pulfrey Assistant Examiner.l. Reed Fisher Attorneys-Curt M. Avery, Arthur E. Wilfond, Herbert L.

Lerner and Daniel J. Tick ABSTRACT: Assembly for stopping the reciprocation of the printing rollers in a platen printing press and locking them in a given position includes a member actuable for disconnecting a cylinder frame arm carrying the inking rollers from an oscillating lever freely mounted on a cylinder frame shaft, and a locking device for locking the cylinder frame arm in a given position wherein the printing rollers are in an upper limiting position on a reciprocating path traversed thereby.

ASSEMBLY FOR STOPPING AND LOCKING THE PRINTING ROLLERS IN A PLATEN PRINTING PRESS My invention relates to platen printing press and more par ticularly to an assembly therein for stopping and locking the printing rollers thereof.

It has been known to hold the printing rollers of a platen printing press, which traverses a reciprocatory path over a generally vertically disposed type form, in a stationary position while preparatory work is being performed at the printing platen or an embossing operation is being performed, for example as described in copending application Ser. No. 704,850 of E. Schwarzbeck, filed Feb. 12, 1968, now U.S. Pat. No. 3,534,680 and assigned to the assignee of the instant application. The stopping of the reciprocatory movement of the printing rollers is frequently necessary while the press is in operation. Special devices and instruments are required for starting and stopping the movement of the inking rollers without breakdown during the rapid operation of the press. Nevertheless, the output of the platen printing presses has been so greatly increased that the stopping of the inking roller movement during operation of the press, considered over a long operating period, presents risks with regard to the trouble-free function thereof. I

It is accordingly an object of my invention to provide assembly for stopping and locking the printing rollers in a platen printing press which avoids the disadvantages of the hereinbe fore mentioned devices employed heretofore for such general purpose.

More specific objects of my invention is to provide such assembly which is greatly simplified over and is less costly than the previously known devices of this type and will operate with absolute reliability for many years of operation of the press.

With the foregoing and other objects in view l endeavor in accordance with my invention to stop the movement of the printing rollers when the press is inoperative or is running slowly by stopping the oscillation of the cylinder frame arms of the press in a position wherein the printing rollers mounted thereon are in an upper limiting position on a reciprocatory path traversed thereby, i.e. are located above the large inking cylinder of the press.

More specifically, according to the invention, I provide a member actuable for disconnecting an oscillating lever, freely mounted on a cylinder frame shaft of the press, from one of the cylinder frame arms to which it is normally connected during printing operation of the press, and a locking device for locking the one cylinder frame arm in agiven position wherein the printing rollers are in an upper limiting position on a reciprocating path traversed thereby.-

In accordance with a further feature of my invention, the disconnecting member comprises an index bolt mounted on the one cylinder frame arm and received in a recess formed in the oscillating lever, the index bolt being retractable from the.

recess for disconnecting the one cylinder frame arm from the oscillating lever.

According to another feature of my invention, the locking device comprises a latch mounted on the frame of the press above the index bolt and manually actuable into locking engagement with the one cylinder frame arm.

Other features which are considered as characteristic for the invention are set forth in the appended claims.

Although the invention is illustrated and described herein as embodied in assembly for stopping and locking the printing rollers in a platen printing press, it is nevertheless not intended to be limited to the details shown, since various modifications may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description, when read in connection with the accompanying drawings, in which:

FIG. I is a fragmentary side elevational view, partly diagrammatic, of a platen printing press provided with the assembly for stopping and locking the printing rollers in accordance with the invention; and

FIG. 2 is a rear elevational view, partly in section, of FIG. I, as seen from the left-hand side of FIG. 1, with the ink transfer system omitted from FIG. 2.

Referring now to the drawings, there is shown a base frame 1 carrying in a conventional manner a vertically disposed-type form or bed 2. A large inking cylinder 3 supplies a pair of inking rollers 4 with fresh ink while the inking rollers 4 are reciprocated from an upper limiting position shown in FIG. I along a path adjacent the type form 2 to a lower limiting position at the bottom of the type form 2. The ink is supplied in distributed form and in selected colors over a number of distributor rollers 5 from an ink fountain to the inking cylinder 3.

The inking rollers 4 are mounted in a conventional manner between respective ends of a pair of cylinder frame arms 6 and 7 which are pivotally mounted on a cylinder frame shaft 8 which is in turn mounted in the base frame I of the platen printing press. An oscillating lever 9 closely swings about the cylinder frame shaft 8 behind the cylinder frame arm 6 as viewed in FIG. 1. ,The oscillating lever is formed with a bore or recess 10 wherein an index bolt ll of a clutch device. mounted on the cylinder frame arm 6 and manually actuable in a conventional manner, is insertable. An abutment member 12 located on the oscillating lever serves to place the bore IQ of the oscillating lever in registry with the index bolt ll carried by the cylinder frame arm 6 when the inking rollers are in the uppermost limiting position thereof as shown in FIG. I, so that accurate clutching therebetween can be effected in that position. Since the abutment member 12 is fixed to the oscillating lever, it oscillates therewith.

A hearing stand 13 is attached to the base frame I or to that part which carries the inking system shown at the upper lefthand side of FIG. 1 and carries a safety latch 14, suitably actuable manually from a known latching position indicated in phantom in FIG. I to a latching position indicated in solid lines in that FIG. The latch 14 is held fast by a compression spring 15 in one or the other position illustrated in FIG. I when passing dead center therebetween. In the uppermost position of the inking roller 4, both cylinder frame arms 6 and 7 abut respective abutment members 16 (only one of which is shown in the FIGS.) which are fastened to part of the framework of the ink distributing system. The reciprocation of the printing rollers 4 is effected in a known manner by a tension rod 17 which is articulatingly connected at one end thereof by a pivot pin 18 to the oscillating lever 9 while it is connected at the other end thereof by a pivot pin 19 to a drive gear 20 rotatably mounted on the frame 1. The drive gear 20 is rotated counterclockwise as shown by the associated arrow in FIG. 1 by a flywheel 21, causing the oscillating lever 9 to execute oscillations about the fixed cylinder frame shaft 8.

If the reciprocating motion of the inking rollers 4 is stopped, the index bolt 11 is retracted from the bore 10 formed in the oscillating lever 9 when the inking rollers 4 are in the uppermost limiting position thereof, as shown in FIG. 1. Simultaneously, the safety latch 14 is pivoted downwardly from the phantom position thereof, shown in FIG. I, and the handle portions located at the outside of the index bolt 11 are thereby latched therewith.

In other words, the stopping and starting of the movement of the printing rollers 4 is effected by withdrawing the index bolt 11 with one hand from the recess 10 of the oscillating lever so as to disconnect the cylinder frame arm 6 from the oscillating lever 9 while with the other hand the safety latch 14 is simultaneously caused to engage the handle of the index bolt 11 in order to lock the inking-rollers 4 in the uppermost position thereof shown in FIG. 1. This is particularly necessary if both printing rollers 4 shown in FIG. 1 are not installed because in such a case there is danger that the cylinder frame arms 6 and 7 will tend to move backwardly down towards the type form 2 due to the weight there-of and the imbalance caused by the fact that only one of the inking rollers 4 is mounted at the end thereof.

Iclaim:

1. ln a platen printing press a cylinder frame shaft. an oscillating lever freely mounted on the shaft, a pair of cylinder frame arms respectively mounted at both ends of the shaft, one of said arms being connected to said oscillating lever inking roller means carried by said cylinder frame arms and reciprocable due to oscillation of said oscillating lever, in a path between an upper and a lower limiting position, a substantially vertically disposed-type form located adjacent said path between said upper and low limiting positions of said inking roller means so that type disposed in said type form is periodically engageable by said inking roller means and is inked thereby, means for disconnecting said oscillating lever from said one cylinder frame arm, said disconnecting means comprising an index bolt mounted on said one cylinder frame arm and receivable in a recess formed in said oscillating lever. said index bolt being retractable from said recess for disconnecting said one cylinder frame arm from said oscillating lever, and means for locking said one cylinder frame arm in a position of said arm wherein said printing roller means are in said upper limiting position thereof whereby said printing roller means is stopped from reciprocating and is locked in said upper limiting position thereof, said locking means comprising a latch mounted on a stationary portion of the press above said index bolt, said latch having means directly connected thereto for manually displacing said latch into locking engagement with said index bolt on said one cylinder frame arm. 

